Switch pkg packages, pub, and dartdoc to use package: imports.

pkg/scheduled_test/test/descriptor_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library descriptor_test;
 
 import 'dart:async';
 import 'dart:io';
 
-import '../../../pkg/pathos/lib/path.dart' as path;
-import '../lib/descriptor.dart' as d;
-import '../lib/scheduled_test.dart';
+import 'package:pathos/path.dart' as path;
+import 'package:scheduled_test/descriptor.dart' as d;
+import 'package:scheduled_test/scheduled_test.dart';
 
 import 'metatest.dart';
 import 'utils.dart';
 
 String sandbox;
 
 void main() {
   expectTestsPass('file().create() creates a file', () {
     test('test', () {
       scheduleSandbox();
@@ skipping 941 matching lines @@
 
 Future<List<int>> byteStreamToList(Stream<List<int>> stream) {
   return stream.reduce(<int>[], (buffer, chunk) {
     buffer.addAll(chunk);
     return buffer;
   });
 }
 
 Future<String> byteStreamToString(Stream<List<int>> stream) =>
   byteStreamToList(stream).then((bytes) => new String.fromCharCodes(bytes));